body{
    /* background-image:url(https://www.yangshangzhen.com/bing/wallpaper);*/

    background-image: linear-gradient(120deg, #a1c4fd 0%, #c2e9fb 100%);
    background-size:cover;
    background-repeat:no-repeat;
    background-attachment:fixed;
}
.form{
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    width: 50%;
    height: 50%;
    border-radius: 30px;
}
.main{
    width: 100%;
    height: 100%;
    bottom: 0;
    position: absolute;
}
.input-un{
    width:200px;
    margin:0 auto;
}